CN1612615A - Image processing circuit, image displaying device and image processing method - Google Patents
Image processing circuit, image displaying device and image processing method Download PDFInfo
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- CN1612615A CN1612615A CNA2004100868152A CN200410086815A CN1612615A CN 1612615 A CN1612615 A CN 1612615A CN A2004100868152 A CNA2004100868152 A CN A2004100868152A CN 200410086815 A CN200410086815 A CN 200410086815A CN 1612615 A CN1612615 A CN 1612615A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
- G09G2340/0428—Gradation resolution change
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2044—Display of intermediate tones using dithering
- G09G3/2051—Display of intermediate tones using dithering with use of a spatial dither pattern
Abstract
The present invention provides an image processing circuit for gradation correction which reduces a capacity for storing correction characteristics data without increasing a clock rate with the interporation processing of correction characteristics, and also provide an image display device and an image processing method therefor.Stores gradation correction characteristics data corresponding to a gradation number which is smaller than the gradation number of inputted image data in a first and second LUT storage parts. Then, the circuit refers to the first and second LUT storage parts with the gradation value of a pixel, which is an object for the gradation correction processing, as an input gradation value, and obtains an output gradation value corresponding to the input gradation value and also obtains an output gradation value corresponding to an adjacent input gradation value. The adjacent gradation value means an input gradation value which is next higher or lower than a certain input gradation value. The output gradation value between these two adjacent gradation values is found by means of linear interporation, and the output gradation values corresponding to the whole input gradation values are obtained, and the gradation correction is made to each pixel of the inputted image data, and then the corrected data are outputted.
Description
Technical field
The tonal correction that the present invention relates to view data is handled, and particularly relates to the tonal correction that the colour correction that utilizes look-up table (LUT) or gamma (γ) revise etc. and handles.
Background technology
In the image display device of display image data, handle as the gamma correction that has that the processing of the display characteristic of adjusting view data according to the characteristic of the display device of CRT, LCD etc. is known.In general, to handle be to utilize the LUT that stores gamma characteristic (tonal correction characteristic, the gray scale correction characteristic) data that the display characteristic according to display device generates etc. to carry out to gamma correction.Gamma characteristic is the characteristic of regulation input tone value (gray value) and output tone value relation, image display device is obtained the output tone value corresponding with the input tone value of input image data with reference to gamma characteristic, carries out the demonstration of view data on display device with this output tone value.
In addition, for input image data, when the desirable look characteristic of consideration is carried out colour correction and shown, use the LUT that stores pre-prepd look conversion characteristics on image display device.One example of colour correction as described above and gamma correction method is documented in the patent documentation 1.
Along with the nearest high image qualityization in mobile phone and other electronic equipment,, then constitute tone (gray scale) and revise the capacity of storage device of RAM etc. of the LUT of performance data and can increase if the tone number of the view data of handling increases.Thereby, having proposed the tone number is stored among the LUT than the tonal correction performance data that the tone number of input image data lacks, insufficient section carries out the method (for example with reference to patent documentation 2) that interpolation is revised by linear approximation etc. to the tonal correction performance data.
Like this,, need 2 output tone value data, read processing thereby need carry out 2 times to the LUT that stores 1 tonal correction performance data as the end points of answering the interpolation part for the tonal correction performance data being carried out interpolation by linear approximation etc.Thereby, exist because of read-around number increases to consume the electric power increase, and need be than the problem of common input clock clock at a high speed.
Patent documentation 1: the spy opens flat 9-271036 communique
Patent documentation 2: special table 2002-534007 communique
Summary of the invention
The present invention proposes in view of above problem, its purpose is to provide to be followed the interpolation of revising characteristic to handle not increase clock speed, can reduce to revise the image processing circuit that is used for the tonal correction performance data, image display device and the image processing method of the memory capacity of performance data.
1 viewpoint of the present invention is in image processing circuit, comprising: the input part of the input of the view data of reception n level tone; The 1st and 2LUT storage part of the tonal correction performance data of the m level tone that storage is lacked than said n level tone; Utilize corresponding with adjacent input tone value, from the above-mentioned the 1st and the output of 2LUT storage part, above-mentioned tonal correction performance data is carried out the interpolating circuit of linear interpolation; And the tonal correction performance data behind the use linear interpolation is carried out the tonal correction circuit of tonal correction to above-mentioned view data.
Above-mentioned image processing circuit can be applied to the colour correction of color image data for example and gamma correction etc., and the corresponding tonal correction performance data of tone number that will lack with the view data tone number than input is stored in the 1st and the 2LUT storage part.Then, the tone value of the pixel that becomes the tonal correction process object as the input tone value, with reference to the 1st and the 2LUT storage part, the corresponding output tone value of input tone value of obtaining the output tone value corresponding and being adjacent with this input tone value.So-called adjacent tone value is meant a last tone value or next tone value of certain input tone value.Then, obtain these 2 the output tone values between the adjacent output tone value, obtain and the corresponding output tone value of whole input tone values by linear interpolation.Like this, each pixel of view data of input is carried out tonal correction, export revised view data.
Because use the LUT of the tonal correction performance data that storage tone number lacks than the tone number of the view data of input,, can reduce to constitute the capacity of storage device of the RAM etc. of LUT so compare during with the tonal correction performance data of storing whole tones.In addition, though for the linear interpolation that carries out the tonal correction performance data needs 2 adjacent output tone values, because use output tone value to carry out linear interpolation, so need not read 1 LUT for 2 times with high speed (for example 2 times) clock from 2 LUT.Thereby, can suppress the high speed of clock, and the increase of the consumption electric power that causes thus.
In a kind of execution mode of above-mentioned image processing circuit, the tonal correction performance data that above-mentioned 1LUT storage part is identical with the 2LUT storage portion stores.Thus, can from each LUT storage part, obtain adjacent 2 output tone values simultaneously, thereby can obtain output tone value between them further by linear interpolation.
In the most preferred embodiment of this execution mode, above-mentioned interpolating circuit uses from the 1st output tone value of above-mentioned 1LUT storage part output with from the 2nd little output tone value of above-mentioned the 1st tone value of ratio of above-mentioned 2LUT storage part output, and the tonal correction performance data between above-mentioned the 1st output tone value and above-mentioned the 2nd output tone value is carried out interpolation.
In another execution mode of above-mentioned image processing circuit, the tonal correction performance data of the above-mentioned m level of above-mentioned 1LUT storage portion stores tone, above-mentioned 2LUT storage portion stores be the difference between the adjacent tone value in the tonal correction performance data of above-mentioned m level tone.Thus, use the difference between the input tone value of importing the corresponding output tone value of tone value with certain and being adjacent, can obtain output tone value between them with linear interpolation.
In the most preferred embodiment of this execution mode, above-mentioned interpolating circuit use is carried out interpolation from the 1st output tone value of above-mentioned 1LUT storage part output and the difference of exporting from above-mentioned 2LUT storage part to above-mentioned the 1st output tone value and the 2nd adjacent tonal correction performance data of exporting between the tone value.
In another execution mode of above-mentioned image processing circuit, above-mentioned 1LUT storage portion stores tonal correction performance data corresponding in the tonal correction performance data of above-mentioned m level tone, the above-mentioned 2LUT storage portion stores tonal correction performance data corresponding in the tonal correction performance data of above-mentioned m level tone with the input tone value of even number with the input tone value of odd number.Thus, can from each LUT storage part, obtain adjacent 2 output tone values simultaneously, thereby can obtain output tone value between them by linear interpolation.In addition, because the combination of the input tone value of input tone value that 2 adjacent input tone values are odd numbers and even number, so, can be reduced to 1/2 to the memory capacity of each LUT storage part by the LUT storage part is set separately accordingly.
In the most preferred embodiment of this execution mode, above-mentioned interpolating circuit comprises: judge from the 1st output tone value of above-mentioned 1LUT storage part output with from the device of the magnitude relationship of the 2nd output tone value of above-mentioned 2LUT storage part output according to above-mentioned input tone value; Export the device that the above-mentioned tonal correction performance data between the tone value is carried out interpolation according to above-mentioned magnitude relationship to exporting tone value and the above-mentioned the 2nd the above-mentioned the 1st.By being the magnitude relationship that odd number or even number are determined 2 output tone values according to above-mentioned input tone value, can easily carry out linear interpolation.
In another execution mode of above-mentioned image processing circuit, above-mentioned interpolating circuit when the corresponding input tone value of a big side is 0 in the tone value with the above-mentioned the 1st and the 2nd output, is exported the medium and small side of tone value to the above-mentioned the 1st and the 2nd and is made as 0 and carries out interpolation.In addition, in other execution mode, above-mentioned interpolating circuit when the input tone value corresponding with the medium and small side of the above-mentioned the 1st and the 2nd output tone value is maximum tone value, exported in the tone value a big side to the above-mentioned the 1st and the 2nd and is made as maximum tone value and carries out interpolation.By using this a kind of method wherein, can all replenish not enough output tone value by linear interpolation.
Another execution mode of above-mentioned image processing circuit possesses, and above-mentioned view data by tonal correction is lost lustre and exports the treatment circuit of losing lustre of the view data of above-mentioned m level tone with dithering process.Thus, according to the display capabilities of the display device of view data, can reduce image data amount and do not reduce picture quality.
In addition, can constitute and possess above-mentioned image processing circuit and show above-mentioned by the image display device of the image displaying part of the view data of tonal correction.For example, use LCD etc., can constitute mobile phone, PDA, digital camera, other image display device as image displaying part.
Another viewpoint of the present invention is, a kind ofly liken the image processing method of carrying out in the image processing circuit for the 1st and 2LUT storage part of the tonal correction performance data of the few m level tone of the n level tone of the tone number of input image data to possessing storage, it comprises: the step that receives the input of above-mentioned input image data; Utilize corresponding with adjacent input tone value, from the above-mentioned the 1st and the output of 2LUT storage part, above-mentioned tonal correction performance data is carried out the step of linear interpolation; And the tonal correction performance data behind the use linear interpolation is carried out the step of tonal correction to above-mentioned view data.
Above-mentioned image processing method can be applied to the colour correction of color image data for example or gamma correction etc., and the corresponding tonal correction performance data of tone number that will lack with the tone number than the view data of input is stored in the 1st and the 2LUT storage part.Then, as the input tone value, reference the 1st and 2LUT storage part are obtained the output tone value corresponding with this input tone value, and the output tone value of the input tone value correspondence that is adjacent the tone value of the object pixels that becomes the tonal correction processing.Then, obtain these 2 the output tone values between the adjacent output tone value, thereby obtain and the corresponding output tone value of whole input tone values by linear interpolation.Like this, each pixel of view data of input is carried out tonal correction, export revised view data.
Description of drawings
Fig. 1 is a block diagram of having used the image display device of image processing circuit of the present invention.
Fig. 2 is the block diagram of the internal structure of expression image processing circuit 101 shown in Figure 1.
Fig. 3 is the block diagram of the structure of expression look transform operation portion.
Fig. 4 is the block diagram of the tonal correction portion of embodiment 1.
Fig. 5 is the figure of explanation linear interpolation operation method.
Fig. 6 be expression lose lustre handling part dither matrix (デ ィ ザ マ ト リ Network ス) example and handle the figure of example.
Fig. 7 is the lose lustre block diagram of structure of handling part of expression.
Fig. 8 is the block diagram of the tonal correction portion of embodiment 2.
Fig. 9 is the block diagram of the tonal correction portion of embodiment 3.
Figure 10 is the figure of the linear interpolation operation method of explanation variation.
Label declaration
10-look transform operation portion, 11～13-multiplier, 14-adder, 20,20a, 20b-tonal correction portion, 21,22,25～28-LUT, 23-linear interpolation computing circuit, 29-data transaction switch, the 30-handling part of losing lustre, 31,32-counter, 33-dither matrix circuit, 34-adder, the 35-change over switch, the 100-image display device.
Embodiment
Below, with reference to the description of drawings best mode for carrying out the invention.
Image processing apparatus.
Fig. 1 is the block diagram of brief configuration that the image display device of image processing circuit of the present invention has been used in expression.As shown in the figure, image display device 100 possesses image processing circuit 101 and image displaying part 102.Can enumerate mobile phone, pocket terminal, PDA, digital camera etc. as the example of image display device 100.
101 couples of view data D1 from the outside input of image processing circuit implement to comprise the tone characteristic correcting process of colour correction and gamma correction, and revised view data D10 is supplied with image displaying part 102.In addition, to image processing circuit 101 inputs and view data D1 clock signal synchronous CLK.Image displaying part 102 possesses for example display device of CRT, LCD (Liquid Crystal Display) etc., shows revised view data D10.
Image processing circuit.
Fig. 2 is the block diagram of the internal structure of expression image processing circuit 101 shown in Figure 1.As shown in the figure, image processing circuit 101 possesses look transform operation portion 10, tonal correction portion 20, the handling part 30 of losing lustre.10 couples of view data D10 from the outside input of look transform operation portion implement the look conversion process to desirable look characteristic, and the view data D2 after the look conversion is supplied with tonal correction portion 20.The view data D10 that is imported is a RGB numerical data of all kinds 8, and look transform operation portion 10 carries out the look conversion process by 3 * 3 matrix operation.View data D2 after the look conversion also is RGB data of all kinds 8.In addition, except view data D1, go back input register control signal Sc to look transform operation portion 10.
View data D3 after 30 pairs of gamma correction of the correction portion that the loses lustre correcting process that loses lustre.As mentioned above, view data D3 after the gamma correction is RGB data of all kinds 8, lose lustre handling part 30 for example by carry out bit slice with 6 of its high position as RGB data of all kinds 6, use to mix according to 2 data of low level and handle the view data D10 of 6 of all kinds of RGB (being equivalent to 8 of all kinds) supply image display device 102 by dithering process.
Lose lustre handling part 30 according to the display capabilities of image displaying part 102, also can not lose lustre and handle and view data supply image displaying part 102 of all kinds 8.For example, have at image displaying part 102 under the situation of display capabilities of all kinds 8, the handling part 30 of losing lustre or not just to handle the view data D10 that is equipped with 8 of looks is supplied with image displaying part 102.On the other hand, have only at image displaying part 102 under the situation of display capabilities of all kinds 6, the handling part 30 of losing lustre can be handled by losing lustre and generate view data supply image displaying part 102 of all kinds 6.In addition, to the view data D3 of handling part 30 after gamma correction of losing lustre, go back input register control signal Sc and horizontal-drive signal Hsync and the vertical synchronizing signal Vsync synchronous with view data D1.
Look transform operation portion.
Below, describe look transform operation portion 10 in detail.The configuration example of Fig. 3 (a) expression look transform operation portion 10.Look transform operation portion 10 possesses, and 3 multipliers 11～13, adder 14, register value control part 15 carry out the matrix operation of 3 * 3 shown in Fig. 3 (b).Each multiplier 11～13 is taken advantage of coefficient a1～a3, the b1～b3 of calculation, and c1～c3 is definite by register value control part 15 according to register controlled signal Sc, and is set in each multiplier 11～13.
Specifically, R (red) the data Rin among 11 couples of view data D1 of multiplier outputs to adder 14 with it after taking advantage of and calculating coefficient a1～a3.G (green) data Gin among 12 couples of view data D1 of multiplier outputs to adder 14 with it after taking advantage of and calculating coefficient b1～b3.B (indigo plant) data Bin among 13 couples of view data D1 of multiplier outputs to adder 14 with it after taking advantage of and calculating coefficient c1～c3.Adder 14 add multiplier 11～13 output and generate Rout, Gout and Bout, they are exported as view data D2.
Because coefficient a1～a3, b1～b3 that register value control part 15 is set, and c1～c3, the look characteristic of the view data D2 of output (being Rout, Gout and Bout) changes.If coefficient a1, b2 and c3 are made as " 1 ", other coefficient value is set to the view data D1 that " 0 " then imports and the view data D2 of output has identical look characteristic.For example, when the view data D2 that will make output has red strong look characteristic, as long as a coefficient a1～a3 who multiplies each other with Rin sets greatly.
The embodiment 1 of tonal correction portion.
The embodiment 1 of tonal correction portion below is described.Fig. 4 represents the brief configuration of the tonal correction portion 20 of embodiment 1.As shown in the figure, tonal correction portion 20 possesses LUT21 and 22, linear interpolation computing circuit 23, register value control part 24.LUT21 and 22 as the gamma characteristic of input tone value 64 grades of tones of storage (being equivalent to 6), stores the gamma characteristic of 256 grades of tones as exporting tone value respectively.Because from the view data D2 of look transform operation portion 10 output is 8 of all kinds of RGB (being equivalent to 256 grades of tones), compares with the tone number of input image data and be reduced so be stored in the tone number of the tonal correction performance data in LUT21 and 22.Thus, can reduce to constitute the capacity of the RAM etc. of LUT21 and 22.In addition, though only represent part in 3 looks corresponding with the R data of RGB in Fig. 4 (a), G data and B data also have same structure.
Fig. 5 (b) expression is stored in an example of the tonal correction performance data (gamma characteristic) in LUT21 and 22.Tonal correction characteristic 60 can be with the curve representation of representing to import tone value and output tone value relation, in LUT with input tone value corresponding address on store the data corresponding with exporting tone value.Thereby, if the tone value of certain pixel of the view data of input as the input tone value, the data that then are stored on the address of the LUT corresponding with this input tone value are output as exporting tone value.In the present example, the input tone value is 64 grades of tones, and the output tone value is 256 grades of tones.
In LUT21 shown in Figure 4 and 22, store identical tonal correction performance data.The reason that 2 LUT are set is because in the linear interpolation computing of linear interpolation operation circuit 23, need become the cause of output tone value of 2 end points of the Properties of Objects of linear interpolation.
In Fig. 4 (a), input is as 6 Rout (7..2) of the high position of the R data of certain pixel among the view data D2 in LUT21.In addition, in the following description, suppose to be in the bracket of Rout () mark the numeral of indicated object position.For example ought be to be expressed as Rout (7..0) under whole 8 situation, be expressed as Rout (1..0) under 2 the situation of low level.LUT21 is these R data are outputed to linear interpolation computing circuit 23 as the output tone value of input during tone value as Xn.
In addition, next tone value Rout-1 (7..0) of the Rout (7..0) that input is imported as the input tone value in LUT21 in LUT22, corresponding output tone value Xn-1 outputs to linear interpolation computing circuit 23.In addition, 2 of the low level of identical pixel value Rout (1..0) supplies with linear interpolation operation circuit 23.
The linear interpolation computing of Fig. 4 (b) pattern face of land timberline interpolation operation circuit 23.As mentioned above, be 8 of all kinds of RGB with respect to the view data of importing, the input tone value that is stored in the tonal correction performance data in LUT21 and 22 is 6 (64 grades of tone parts).Thereby, need carry out interpolation by 23 pairs of output tone values corresponding of linear interpolation computing circuit with 2 not enough input tone value.Shown in Fig. 4 (b), linear interpolation computing circuit 23 carries out computing, between the corresponding output tone value Xn-1 of the output tone value Xn corresponding and its Next input tone value Rout-1 (7..0), according to 3 output of the value linear interpolation tone value of 2 Rout (1..0) of the low level of this pixel with the input tone value Rout (7..2) of certain pixel.Thus, linear interpolation computing circuit 23 utilizes 64 grades of tones (6 s') LUT21 and 22, can generate 256 grades of tones (8 s') tonal correction performance data.
Specifically, the computing of linear interpolation computing circuit 23 is represented by following formula.
R (lut_out)=Xn-1+ (Xn-Xn-1) * (Rout (1..0) [Dec]/4)+OFF_set (formula 1)
But, when Rout-1 (7..2)=-1, establish Xn-1=0.([Dec] represents decimal number)
At this, the collateral condition of formula 1.When the tonal correction performance data of input tone value with 64 grades of tones being carried out linear interpolation and generates the tonal correction performance data of input tone value with 256 grades of tones, shown in Fig. 4 (b), if in tone value 0～63 in the interval of 2 adjacent tone values 3 tone values of interpolation then integral body be:
64 (the tone number in the LUT)+(tone value)=253,63 (0～63 space-number) * 3 lack 3 grades of tones in 256 grades of tones.Thereby, by replenishing 3 grades of tones, make integral body become 256 grades of tones at input tone value (to the Input Address of LUT)=0 downside.
With reference to Fig. 5 (a), for example when the time, export between tone value X0 and the X1 as long as 3 output tone values representing with symbol 90 are replenished from output tone value Xn=X1, the Xn-1=X0 of LUT21 and 22.To this, when output tone value Xn=X0, do not exist though export tone value Xn-1 originally, accordingly the output tone value was set at Xn-1=" 0 ", 3 grades of tones that interpolation is represented with symbol 91 in Fig. 5 all the time with input tone value Rout-1 (7..2)=-1.This is equivalent to the part of interpolation dotted line 61 in Fig. 5 (b).Thus, can generate the tonal correction performance data of input tone value with whole 256 grades of tones.
In addition, in the structure shown in Fig. 4 (a), according to register controlled signal Sc side-play amount OFF_set is supplied with linear interpolation operation circuit 23 by register controlled portion 24, can make the tonal correction characteristic 60 direction overall offset that increases to tone value like that as shown in arrow 70 of Fig. 5 (b) example.
Like this, in tonal correction portion 20, view data with respect to the RGB 8 of all kinds (256 grades of tones) that imports, the tonal correction performance data of the input tone value with 6 of all kinds (64 grades of tones) is stored among the LUT, and insufficient section generates the output tone value according to 2 of low level of input tone value by linear interpolation and carries out tone characteristic correction (gamma correction).Thus, do not need to store the tonal correction performance data of input tone value, thereby can reduce to constitute the capacity of storage part of the RAM etc. of LUT with 256 grades of tones corresponding with whole tone numbers of view data of input.In the present embodiment, compare with the situation that the tonal correction performance data with input tone value of 256 grades of tones is stored among the RAM, because, just can so total RAM capacity needs only 1/2 as long as prepare the tonal correction performance data of the input tone value with 64 grades of tones of 2 LUT amounts.
In addition, in the present embodiment, prepare 2 LUT, from each LUT, read out in the output tone value Xn and the Xn-1 of 2 end points that use in the linear interpolation.As mentioned above, though under the situation of the output tone value of from 1 LUT, reading 2 end points, need to make the readout clock high speed, and owing to do not need high speed in the present embodiment, so can suppress to consume the increase etc. of electric power.
The circuit of losing lustre.
Below, describe the handling part of losing lustre in detail.As shown in Figure 2, lose lustre handling part 30 from the RGB of tonal correction portion 20 outputs view data D3 of all kinds 8, to be R (lut_out), G (lut_out) and B (lut_out) by bit slice and dithering process lose lustre exports as view data D10 for view data of all kinds 6.Fig. 7 represent to lose lustre example of structure of handling part 30.In addition, though Fig. 7 only is illustrated in part in 3 looks corresponding with the R data of RGB, G data and B data also have same structure.
In Fig. 7, the handling part 30 of losing lustre possesses, 2 digit counters 31 and 32, dither matrix circuit 33, adder 34, change over switch 35, register value control part 36.Fig. 6 (a) is illustrated in the dither matrix circuit 33 example of 4 * 4 the dither matrix that uses.
Counter 31 outputs to dither matrix circuit 33 to 2 X address Xad by to counting with view data D3 clock signal synchronous CLK.In addition, counter 31 is resetted by horizontal-drive signal Hsync.In addition, counter 32 outputs to dither matrix circuit 33 to 2 Y address Yad by horizontal-drive signal Hsync is counted.In addition, counter 32 is resetted by vertical synchronizing signal Ysync.
Dither matrix circuit 33 is supplied with adder 34 to the value of stipulating as R (D_out) according to the X address Xad and the Y address Yad of input in dither matrix.Shown in Fig. 6 (b), adder 34 adds from the R data R (lut_out) of tonal correction portion 20 output with from 2 of the high position of the value R (D_out) of dither matrix circuit 33 outputs, 6 input terminal b that output to change over switch 35 as R (ADD_out) of its result's a high position.Like this, the RGB view data D3 of all kinds 8 that supplies with from tonal correction portion 20 is lost lustre and is view data of all kinds 6.In addition, because used dithering process,, view data of all kinds 6 is equivalent to look characteristic of all kinds 8 so having.
The output of change over switch 35 is correspondingly switched with the register value of exporting according to register controlled signal Sc register value control part 36.When selecting the input terminal a of change over switch 35, the RGB view data of handling of all kinds 8 is exported as view data D10 not losing lustre.When selecting the input terminal b of change over switch 35, export as view data D10 handling the RGB view data of all kinds 6 that obtains by losing lustre.
The embodiment 2 of tonal correction portion.
Below, the embodiment 2 of tonal correction portion is described.The structure of the 20a of tonal correction portion of Fig. 8 (a) expression embodiment 2.In embodiment 2, be stored in the content difference of the tonal correction performance data in 2 LUT.In the tonal correction portion 20 of embodiment 1, the identical tonal correction performance data of storage in 2 LUT21 and 22.To this, in embodiment 2, storage has the tonal correction performance data of the input tone value of 64 grades of tones in 1 LUT26, is stored in the difference between the tone value adjacent in the tonal correction performance data of storing among the LUT26 in another LUT25.Others are identical with embodiment 1 basically.
Input tone value Rout (7..2) the input LUT25 of certain pixel in the view data of input, Dui Ying difference DELTA X supplies with linear interpolation operation circuit 23 with it.In addition, next input tone value Rout-1 (7..2) input LUT26 of same pixel, Dui Ying output tone value Xn-1 supplies with linear interpolation operation circuit 23 with it.
The linear interpolation computing of Fig. 8 (b) pattern face of land timberline interpolation operation circuit 23.As shown in the figure, the difference DELTA X from LUT25 output represents the output tone value corresponding with the input tone value of this pixel and imports the poor of the corresponding output tone value of tone value with next.Thereby linear interpolation computing circuit 23 utilizes output tone value Xn-1 and difference DELTA X, to carrying out interpolation between these adjacent output tone values.Specifically, linear interpolation computing circuit 23 carries out the computing shown in the following formula.
R (lut_out)=Xn-1+ Δ X * (Rout (1..0) [Dec]/4)+OFF_set (formula 2)
But when Rout-1 (7..2)=-1, establish Xn-1=0.([Dec] represents decimal number)
In addition, the situation of the formula 1 among the meaning of the additional conditions of formula 2 and the embodiment 1 is the same.
LUT25 needs only the difference DELTA X between the adjacent output tone value of storage.Be appreciated that because difference DELTA X compares and can show with few tone with self-tone correction data self, so the tone value (figure place of promptly lacking) that LUT25 can be arranged to than LUT26 is little from Fig. 8 (b).For example, if the LUT25 of saved differences is arranged to have the LUT of the output of 16 grades of tones (4), then can the RAM capacity setting that constitutes LUT25 become be constitute LUT26 RAM capacity 1/2.In this case, the situation that has 1 LUT of 8 (256 grades of tones) output tone value with use is compared, and can be the needed whole RAM capacity setting of LUT 3/8 then.
In addition, under the situation of embodiment 1, when in LUT21 and 22, storing the tonal correction performance data, as long as in 2 LUT, merely store pre-prepd tonal correction performance data.To this, under the situation of embodiment 2, pre-prepd tonal correction performance data is stored in LUT26, and need be stored among the LUT25 according to this tonal correction performance data calculated difference.
The embodiment 3 of tonal correction portion.
Below, the embodiment 3 of tonal correction portion is described.In embodiment 1, the identical tonal correction performance data of the input tone value with 64 grades of tones is stored in 2 LUT21 and 22.But, the input tone value of certain pixel that 2 output tone values that use in linear interpolation operation are view data and adjacent with it (1 or following 1 thereon) input tone value.Thereby, if the side in these adjacent 2 input tone values is an odd number then the opposing party is an even number, if a side is an even number then the opposing party is an odd number on the contrary.That is 2, adjacent input tone value both sides can not be even number or odd number simultaneously.Thereby, in present embodiment 3, the tonal correction performance data of 64 grades of tones being divided into tonal correction performance data corresponding with the input tone value of odd number and the tonal correction performance data corresponding with the input tone value of even number, separate storage is in 2 LUT.Thus, can reduce to constitute the capacity of the RAM of LUT further.
Fig. 9 represents the structure of the tonal correction portion of embodiment 3.The corresponding tonal correction performance data of input tone value of LUT27 storage and the odd number of 32 grades of tones, LUT28 stores the corresponding tonal correction performance data of input tone value with the even number of 32 grades of tones.In addition, the back segment in LUT27 and 28 is provided with data transaction switch 29.
In the view data of input, the Rout corresponding with the input tone value of even number (7..3) is input to LUT28, and corresponding output tone value Xq outputs to data transaction switch 29.In addition, the Rout-1 corresponding with the input tone value of odd number (7..2) is input to LUT27, and corresponding output tone value Xp outputs to data transaction switch 29.In addition, the Rout (2) of the 3rd of the expression that begins from the low level of view data of input is input to data transaction switch 29.6 an of high position that Rout (2) expression becomes the object pixels of tone characteristic correction are even number or odd number, and its control signal as the switching that is used to adopt data transaction switch 29 is used.Data transaction switch 29 switches the relation of input and output according to Rout (2), and a side big among output tone value Xp and the Xq as output tone value Yn, is supplied with linear interpolation operation circuit 23 to a little side as output tone value Yn-1.
The linear interpolation computing of Fig. 9 (b) pattern face of land timberline interpolation operation circuit 23.Linear interpolation computing circuit 23 is according to 2 Rout (1..0) of the low level of the output tone value Yn that supplies with from data transaction switch 29 and Yn-1 and expression input tone value, to carrying out interpolation between output tone value Yn and the Yn-1.Specifically, the linear interpolation computing is represented with following formula.
R (lut_out)=Yn-1+ (Yn-Yn-1) * (Rout (1..0) [Dec]/4)+OFF_set (formula 3)
But when Rout-1 (7..2)=-1, establish Yn-1=0.([Dec] represents decimal number), in formula 3, the meaning provisory was the same with embodiment 2 with embodiment 1 in addition.
Like this, in embodiment 3, because the tonal correction performance data separate storage of 64 grades of tones the LUT27 corresponding with the input tone value of odd number and with the corresponding LUT28 of the input tone value of even number in, so can further reduce to constitute the needed RAM capacity of LUT.In fact, as mentioned above, comparing with the situation of the LUT that uses 1 input tone value with 256 grades of tones, total RAM capacity then is 1/4, also is 1/2 even compare total RAM capacity with embodiment 1.
Variation.
In the embodiment 1 to embodiment 3 of the tonal correction portion of above explanation, as reference Fig. 5 explanation like that, in linear interpolation is handled, at additional 3 tone values of the downside of input tone value=0 and 256 grades of tones of whole formation.Replace them as shown in figure 10, also can add 3 grades of tones at the upside of input tone value=63 and 256 grades of tones of whole formation.In this case, as 2 in the embodiment 1 medium and small sides of input tone value, when promptly importing tone value Xn-1=63, as long as an output tone value corresponding with importing tone value Xn is set at " 256 ".In embodiment 2 and embodiment 3 too.
But, because need when the time handle value " 0 " to be stored in the register etc. at additional 3 tone values of the little side of tone value, when at additional 3 tone values of the big side of tone value, a value " 255 " is stored in the register etc., so the register occupancy volume is very little just passable when the little side of tone value is added 3 tone values.In addition, in little side of tone value or a big side, if, then can reduce influence to display image at additional 3 tones of black one side that is equivalent to display image.
In addition, in the above embodiments 1,2 input tone values that use in linear interpolation is handled are made as tone value Rout (7..2) and its next tone value Rout-1 (7..2) of certain pixel.Replace this tone value Rout (7..2) that also can use certain pixel and on it tone value Rout+1 (7..2) carry out linear interpolation.
In addition, in embodiment 2, though storage tone value Rout (7..2) of certain pixel and the difference of its next tone value Rout-1 (7..2) in LUT also can replace this tone value Rout (7..2) that stores certain pixel in LUT and the difference of a tone value Rout+1 (7..2) on it.
Claims (12)
1. an image processing circuit is characterized in that, comprising:
The input part of the input of the view data of reception n level tone;
The 1st and 2LUT storage part of the tonal correction performance data of the m level tone that storage is lacked than said n level tone;
Utilize corresponding with adjacent input tone value, from the above-mentioned the 1st and the output of 2LUT storage part, above-mentioned tonal correction performance data is carried out the interpolating circuit of linear interpolation; And
Tonal correction performance data behind the use linear interpolation is carried out the tonal correction circuit of tonal correction to above-mentioned view data.
2. the described image processing circuit of claim 1 is characterized in that: the tonal correction performance data that above-mentioned 1LUT storage part is identical with the 2LUT storage portion stores.
3. the described image processing circuit of claim 2, it is characterized in that: above-mentioned interpolating circuit uses from the 1st output tone value of above-mentioned 1LUT storage part output with from the 2nd little output tone value of above-mentioned the 1st tone value of ratio of above-mentioned 2LUT storage part output, and the tonal correction performance data between above-mentioned the 1st output tone value and above-mentioned the 2nd output tone value is carried out interpolation.
4. the described image processing circuit of claim 1, it is characterized in that: the tonal correction performance data of the above-mentioned m level of above-mentioned 1LUT storage portion stores tone, above-mentioned 2LUT storage portion stores be the difference between the adjacent tone value in the tonal correction performance data of above-mentioned m level tone.
5. the described image processing circuit of claim 4, it is characterized in that: above-mentioned interpolating circuit use is carried out interpolation from the 1st output tone value of above-mentioned 1LUT storage part output and the difference of exporting from above-mentioned 2LUT storage part to above-mentioned the 1st output tone value and the above-mentioned the 2nd adjacent tonal correction performance data of exporting between the tone value.
6. the described image processing circuit of claim 1, it is characterized in that: above-mentioned 1LUT storage portion stores tonal correction performance data corresponding in the tonal correction performance data of above-mentioned m level tone, the above-mentioned 2LUT storage portion stores tonal correction performance data corresponding in the tonal correction performance data of above-mentioned m level tone with the input tone value of even number with the input tone value of odd number.
7. the described image processing circuit of claim 6 is characterized in that, above-mentioned interpolating circuit comprises:
Judge from the 1st output tone value of above-mentioned 1LUT storage part output with from the device of the magnitude relationship of the 2nd output tone value of above-mentioned 2LUT storage part output according to above-mentioned view data;
Export the device that the above-mentioned tonal correction performance data between the tone value is carried out interpolation according to above-mentioned magnitude relationship to exporting tone value and the above-mentioned the 2nd the above-mentioned the 1st.
8. claim 3,5 or 7 described image processing circuits, it is characterized in that: above-mentioned interpolating circuit, when the corresponding input tone value of a big side is 0 in the tone value with the above-mentioned the 1st and the 2nd output, exports the medium and small side of tone value to the above-mentioned the 1st and the 2nd and be made as 0 and carry out interpolation.
9. claim 3,5 or 7 described image processing circuits, it is characterized in that: above-mentioned interpolating circuit, when the input tone value corresponding with the medium and small side of the above-mentioned the 1st and the 2nd output tone value is maximum tone value, exports in the tone value a big side to the above-mentioned the 1st and the 2nd and be made as maximum tone value and carry out interpolation.
10. any described image processing circuit of claim 1 to 8 is characterized in that: possess by dithering process and above-mentioned view data by tonal correction is lost lustre and export the treatment circuit of losing lustre of the view data of above-mentioned m level tone.
11. an image display device is characterized in that: the image displaying part of the view data after possessing any described image processing circuit of claim 1 to 10 and showing above-mentioned tonal correction.
12. image processing method, be to liken the image processing method of carrying out in the image processing circuit for the 1st and 2LUT storage part of the tonal correction performance data of the few m level tone of the n level tone of the tone number of input image data to possessing storage, it is characterized in that, comprising:
Receive the step of the input of above-mentioned input image data;
Utilize corresponding with adjacent input tone value, from the above-mentioned the 1st and the output of 2LUT storage part, above-mentioned tonal correction performance data is carried out the step of linear interpolation; And
Tonal correction performance data behind the use linear interpolation is carried out the step of tonal correction to above-mentioned view data.
Applications Claiming Priority (2)
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| JP370631/2003 | 2003-10-30 | ||
| JP2003370631A JP4013887B2 (en) | 2003-10-30 | 2003-10-30 | Image processing circuit, image display device, and image processing method |
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| CN1320826C CN1320826C (en) | 2007-06-06 |
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| US (1) | US7499199B2 (en) |
| JP (1) | JP4013887B2 (en) |
| KR (1) | KR100622180B1 (en) |
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| TW (1) | TWI291686B (en) |
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| CN106981277B (en) * | 2016-01-19 | 2019-06-11 | 上海和辉光电有限公司 | The method of adjustment of tone for display, apparatus and system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100622180B1 (en) | 2006-09-19 |
| US20050111046A1 (en) | 2005-05-26 |
| JP4013887B2 (en) | 2007-11-28 |
| JP2005135157A (en) | 2005-05-26 |
| TWI291686B (en) | 2007-12-21 |
| TW200523869A (en) | 2005-07-16 |
| CN1320826C (en) | 2007-06-06 |
| US7499199B2 (en) | 2009-03-03 |
| KR20050041924A (en) | 2005-05-04 |
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